Connecting-plug.



FRANK B. COOK, OF CHICAGO, ILLINOIS, ASSIGNOR. T0 FRANK B. COOK COMPANY, 01E" CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CONNECTINGr-ILUG.

Specification of Letters Patent.

Patented @Inly IO, IQI'L Original application lexi January 15, 1915, Serial No. 2,422. Divided and. this application' med .une 12,

l 1916. Serial No.ll03,102.`

To all ughom t may concern;

Be it known that I, FRANK B. Coon', a

lcitizen of the United States, residing 'at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Connecting-Plugs, of whichthe lfollowing' is a full, clear, concise, and exact description, reference beingvhad to the accompanying drawings, forming a part of this specification.` v

My invention relates to electric switches employing complemental parts in the form of spring jacks and conducting plugs. The claims in the present application relate to plugs, this application being a division of my original application Serial No. 2,422, :tiled January 15, 1915.

My invention includes a connecting plug having a 'metallic tubular member and a metallic portion at the front of the tubular member, there being filling. of insulation in the tubular member through which a conductor leading tothe other metallic portion passes. 'Ihis filling is desirably inserted under pressure and in order that said conductor may not be forced into yshort circuiting contact by the filler such lconductor is covered withinsulation prior to its insertion within the tubular member.- p

I will explain my invention more fullyby reference to the accompanying drawin showing the preferred embodiment thereo and in which Figure 1 is a View with the plug portion of the swit'ch in elevation and a part of the jack, which coperates with the plug, in section; Fig. is a sectional view; Fig, 3 is a sectional view on line 3 of Fig. 2; Fig. 4 is a sectional view on lire 4 4 of Fig. 2; and Fig. 5 is a sectional view on line 5 5 of Fig. 2.

Like parts are, indicated by similar characters of reference throughout the did'erent gures. i

A strip `1 of insulation of a length corresponding to the numberof spring Jacks to be mounted is provided with a front rail,2 in which the Vthimbles 3 or other third 'jack contacts are disposed, Jthe bores of the thimbles's'nugly receivingy the forward continu-1 ation of the plug, or third, contact portionv 4. 'Ihetalking contact springs 7 and 8 are mounted upon the top and bottom sides of the strip 1. The plug illustrated includes.

' k-nown manner.

respect to the strip rai-l 2 and thimbles 3 that saidthimbles are incapable of having simultaneous connection with any two plug v contacts.

'Ihe contact portion 4 is generally tubular lbut is desirably cut away at an intermediate portion to adord access to its anterior at points where connections are to be .made with the contacting or other strands `of the cord circuit of which the plug forms a part. The forward end of the bore of the tubular conductor 4 is filled with insulation 18 which is continued rearwardly of the oints of attachment of the aforesaid cor strands where the filling of insulating material may support short threaded nuts 19 and 20 into which binding screws 21 may be threaded to clamp the cord conductors 22 in place', the third conducting cord being electrically connected -with the heel contact 4 in` a well The terminal nuts 19 and 20 are respectively connected with ythe ring 17 and tip 16 by means of conductors 23 and v24 which are soldered or` otherwise have connection with the ring and tip. The molding insulating material is Aforced into a Space in the tubular element 4 in which the conductors 23 and 24 are previously disposed and in order to prevent the flowing insulatv ing material from bringing these conductors l into direct contact with each other or with other metallic potions of the plug that should be insulated therefrom I employ insulation about the conductors 23, 24 that is present upon the conductors before their insertion inthe plug, which is referably in the form of enamel but-whic may be of other. formit desired, and while these insu-I,

lated conductors 'are preferably separatel formed from thel plug contacts to whic they extend I do not wish to bel limited to this characteristic .since the insulation thereot'prevents undesirable contact of these conl diictors in the event of in]uryor deterioration. 1

' hile have shown a plug having three complemental contact portions I do not wish to be limited to the number of contact portions employed.

Having thus described my invention I claim as new and desire to secureby Letters Patent the following 1. A conducting plug including two -forward contact portions; a tubular Contact portion to the rear of the other contact portions; conductors -in electrical connection with said forward contact portions and passing through the bore of said tubular contact portion; and a4 filling of insulation within the bore of the contact portion through ywhich filling the conductors pass, said conductors being insulated previous to their insertion within the plug to prevent the filling of insulation from forcing the conductors into engagement ywith the tubular contact portion.

2. A. conducting plu including a forward contact portion; a tuular contact portion to the rear of the other Contact portion; a conductor in electrical connection with said forward contact portion and passing through the bore of said tubular portion; and a filling of insulation within the bore of the contact portion through which filling the conductor passes, this conductor being insulated previous to its insertion within the plug to prevent the filling of insulation from forcing the conductor into engagement with the tubular contact.

In witness whereof, I hereunto subscribe my name this twenty-fifth day of January,

FRANK B. COOK. Witnesses:

G. L. CRAGG, ETTA L. WHITE. 

